Instrumental neutron activation analysis of environmental samples from a region with prevalence of population disabilities in the North Gondar, Ethiopia

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

“…Agreement of our values with NIST certified values within uncertainty margins proved the accuracy of our results. The only exception was a significantly higher value for Na compared to the NIST certified value, which, however, has previously been found in our laboratory and other laboratories as well . The difference between matrix composition of the materials studied in this work and that of NIST SRM 1515 does not invalidate the proof of accuracy because of matrix independence of NAA.…”

“…The only exception was a significantly higher value for Na compared to the NIST certified value, which, however, has previously been found in our laboratory and other laboratories as well. 38 The difference between matrix composition of the materials studied in this work and that of NIST SRM 1515 does not invalidate the proof of accuracy because of matrix independence of NAA. The concentration obtained on NIST SRM 1515 standard and certified concentration are shown in Table S5.…”

“…and long-term (3 h) irradiations were carried out at thermal neutron fluence rates of 3−4 × 10 13 cm −2 s −1 , as given in our previous publication, in which the relative calibration employed using synthetic multielement standards (MES), and choice of decay and counting times are also described. 38 The γ-ray spectra of samples, standards, and monitors were measured with coaxial high-purity germanium (HPGe) detectors. For the counting of short-lived radionuclides, a coaxial HPGe detector with relative efficiency of 21% and full width at half-maximum (fwhm) resolution 1.80 keV, both for the 1332.5 keV photons of 60 Co, was employed, whereas for the counting of medium-and long-lived radionuclides, another coaxial HPGE detector with a relative efficiency of 78% and fwhm resolution of 1.87 keV was used.…”

“…Both short-term (1 min.) and long-term (3 h) irradiations were carried out at thermal neutron fluence rates of 3–4 × 10 13 cm –2 s –1 , as given in our previous publication, in which the relative calibration employed using synthetic multielement standards (MES), and choice of decay and counting times are also described . The γ-ray spectra of samples, standards, and monitors were measured with coaxial high-purity germanium (HPGe) detectors.…”